joined by fran townsend, niolecurity analyst and former assistant to george w. bush for security and counterterrorism and with me in boston, cnn analyst julia kayam, a homeland security official right here inst. i want t start with you, corema as chair of t iss holand security mmittee. atreou hearing this morning? >> well, first, my heart goes out to the victims and families. omar on, i calle ts a erday, act of trism i was a federal prosecutor that rk counterterrorism. ltiple bombs going on ed. simultaneously, mass casualties, spectacular event, fits all of attack.icators of the terrorist and we know there w a person of interest,n one of the spal a search warrant executed. not sure what has ce t that, but inoha between surveillance videos out at the scene and the idea to reverse engineer these bombs to find the e it back to the perpetrate o and the motivation. but at this time, while it is an ac o terrorism, won known it's foreign or domestic atta. >>ngssn, should say, we do know that search in revere, we know it was done with necessary. warrant was bu a you sai